D-ring



FIG. 1 shows a front view of my design for a D-ring; FIG. 2 shows abottom view thereof; FIG. 3 shows a rear view thereof; FIG. 4 shows atop view thereof; FIG. 5 shows a side view thereof, with the oppositeside being identical; and, FIG. 6 shows a perspective view thereof.

The ornamental design for a D-ring, as shown and described.